Piecewise complex systems with circular switching manifolds admit at most 3 limit cycles in the linear antiholomorphic case and 10 in the quadratic case, with new algebraic examples and a rigidity result for holomorphic normal forms.
Kunze.Non-smooth dynamical systems, volume 1744 ofLect
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Limit cycles in piecewise smooth systems with circular switching manifold
Piecewise complex systems with circular switching manifolds admit at most 3 limit cycles in the linear antiholomorphic case and 10 in the quadratic case, with new algebraic examples and a rigidity result for holomorphic normal forms.